
1) Irish girl name 2) Tuatha Dé Danann
Found on
https://www.crosswordclues.com/clue/niamh

Niamh (ˈniːəv, with two syllables) is an Irish language feminine given name meaning `bright` or `radiant`. Anglicised forms of the name are Niav, Neve, Neave, Neeve and Nieve. The Old Irish spelling is Niaṁ. In Irish mythology, Niamh was a goddess, the daughter of the god of the sea and one of the queens of Tír na nÓg, the land of etern...
Found on
http://en.wikipedia.org/wiki/Niamh

Nickel Metal Hydride.
Found on
http://www.encyclo.co.uk/visitor-contributions.php

Niamh is an Irish name for girls. The meaning is `brightness` The name Niamh is most commonly given to Scottish girls. Niamh is at number 32 in the top 50 of Scottish girls (average of 10 years data) Niamh is given to boys and girls in the Netherlands The name sounds like: Naama, Noami, Nioma Similar names are: Niah, Miah, Niada, Nia, Nyah
Found on
https://www.pregnology.com/names/girls/Niamh
No exact match found.